Herforder Elektromotoren Werke motors Germany Herforder Elektromotoren Werke models Herforder Elektromotoren Werke prices

Herforder Elektromotoren Werke motors are AC motors that generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are mainly used as motors to drive various production machinery, such as: fans, pumps, compressors, machine tools, light industry and mining machinery, threshers and crushers in agricultural production, processing machinery for agricultural and sideline products, etc. Simple structure, easy manufacturing, low price, reliable operation, robust and durable, high operating efficiency and suitable working characteristics.

Herforder Elektromotoren Werke motor structure

Motors are divided into two forms according to the rotor structure: squirrel-cage (squirrel-cage asynchronous motor) and wound-rotor asynchronous motor. Asynchronous motors operating as motors. Because the rotor winding current is induced, they are also called Induction motors. Asynchronous motors are the most widely used and highest demand type among various motors. In electrically powered machinery in various countries, about 90% are asynchronous motors, among which small asynchronous motors account for more than 70%. In the total load of the power system, the electricity consumption of asynchronous motors accounts for a significant proportion. In China, the electricity consumption of asynchronous motors accounts for more than 60% of the total load. An asynchronous motor is an AC motor whose speed under load is not constant relative to the frequency of the connected power grid. An Induction motor is an asynchronous motor with only one set of windings connected to the power supply. Where there is no risk of misunderstanding or confusion, an induction motor can generally be referred to as an asynchronous motor. The IEC standard states: The term "induction motor" is actually used as a synonym for "asynchronous motor" in many countries, while some other countries use only the term "asynchronous motor" to represent both concepts.

Herforder Elektromotoren Werke motor phase angle and torque

The motor phase difference angle (torque angle) is the phase difference δ between the no-load induced electromotive force generated by the magnetic field and the armature voltage. The torque of a synchronous motor is proportional to sin (δ), and reaches the theoretical xxx torque at δ = 90 degrees (for cylindrical motors; different for salient-pole motors). In addition, since the motor rotates synchronously with the frequency of the armature voltage, the output is proportional to the torque. If the load torque is too large, it stops due to "out of step (loss of synchronism)". The torque at this time is called "pull-out torque", and serves as the phase difference angle within the range of 50-70 degrees.

Herforder Elektromotoren Werke motor applications

Motor variable frequency speed control has become the mainstream speed control solution and can be widely used in stepless speed transmission in various industries. Especially with the increasingly wide application of inverters in the field of industrial control, the use of variable frequency motors has also become increasingly widespread. It can be said that due to the superiority of variable frequency motors over ordinary motors in variable frequency control, we can easily see variable frequency motors wherever inverters are used. The social benefits of domestically produced high-voltage variable frequency devices are significant, mainly including energy saving, thereby conserving resources and reducing environmental pollution. Eliminate motor starting shock and impact on the power grid, reduce motor and equipment failure rates. Improve control precision and automation level. The economic benefits of variable frequency speed control are also very significant. For pumps and fans, fluid flow is directly proportional to the first power of speed, torque is proportional to the square of speed, and power is proportional to the cube of speed. When speed decreases, motor power consumption decreases by the cube, so the energy-saving effect of variable frequency speed control is very significant. If the flow rate drops from to, then the speed drops to, then the speed drops to, the head drops to, and the motor power consumption drops to, theoretically saving energy. If dampers or valves were originally used for regulation, flow rate decreases, head increases, and motor power decreases. In this way, variable frequency speed control saves more energy than damper or valve regulation. In addition to energy saving and efficiency improvement, there are some indirect economic benefits for different loads, mainly including improved power factor, realization of soft start, reduction of electrical and mechanical damage to the motor caused by starting torque, and smooth, stable, and high-precision control.

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